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Liquid Phase Treatment

Nitrates

Nitrates

Nitrate solutions are typically fed at pumping stations to control sulfide formation in force mains, where anaerobic conditions may occur because oxygen transfer to the wastewater is limited. Feeding nitrate solutions to control sulfide formation and release is the most common form of chemical treatment in collection systems.

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Magnesium Hydroxide Addition

Magnesium Hydroxide Addition

Magnesium hydroxide (Mg(OH)2) is a chemical treatment for wastewater, used for hydrogen sulfide (H2S) control in wastewater collection systems and at treatment plant headworks processes. Magnesium hydroxide is an alkali source that works by increasing the pH of the treated wastewater. The chemical is typically added to the wastewater as a slurry at a collection system pump station or at an injection point immediately upstream from a pump station.

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Iron Salts Addition

Iron Salts Addition

Iron Salts are a chemical treatment for wastewater, often added to wastewater collection systems upstream from treatment plant influents to control hydrogen sulfide emissions. Iron Salts include Ferrous Chloride, Ferrous Sulfate and Ferric Chloride. Iron Salts are precipitants that oxidize and precipitate dissolved sulfides in wastewater to form iron sulfides. The iron sulfides are insoluble and cannot be stripped from the wastewater.

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Hydrogen Peroxide Addition

Hydrogen Peroxide Addition

Hydrogen peroxide (H2O2) is a powerful oxidant that oxidizes hydrogen sulfide (H2S), with byproducts of sulfur, water and oxygen. Hydrogen peroxide is commonly injected into a wastewater stream (force main, gravity sewer) to control H2S and other odorous compounds associated with wastewater collection and treatment. It is often injected just upstream of wastewater treatment facilities to minimize emissions at the headworks and primary clarification processes. The chemical may also supplement dissolved oxygen levels in the wastewater to prevent additional formation of hydrogen sulfide.

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Oxygen Injection

Oxygen Injection

Oxygen injection is a chemical treatment for wastewater, used for the prevention of hydrogen sulfide formation and/or oxidation of sulfides in the wastewater. The process is similar to the nitrate addition process, except that dissolved oxygen is the oxidizing agent instead of nitrate. The oxygen injection process involves adding dissolved oxygen into a force main at a pumping station.

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Webster Environmental Associates, Inc.

13121 Eastpoint Park Blvd #E
Louisville, KY 40223

Office: (502) 354-4002

Fax: (502) 253-3442